He replaces Nichola Pease, who steps down after a dec- ade to become deputy at the company.
Rochussen starts in November having previously worked for family officer provider Fleming Family & Partners for the past five years. He has also taken an equity stake in JOHCM.
Pease will remain actively involved with the firm, and retains her equity stake. She will focus on the recruitment of fund managers and the existing teams in place.
JOHCM chairman Jamie Hambro says: “Nichola came to the board and expressed the view that the firm needed a full-time CEO to fulfil its potential.
“As a consequence, we are delighted to appoint Gavin, who I believe has the management ability and entrepreneurial talent to make a real difference here.”
Pease says: “Gavin’s brief is to maintain the investment-led culture of the company, where the interests of clients and the firm are aligned, and to continue its growth and divers- ification.”